A lens assembly includes a lens body, a first lens, a second lens, a third lens and a fourth lens, wherein the lens body includes a lens barrel, and the first lens, the second lens, the third lens and the fourth lens are fixed in the lens body in order from an object side to an image side along an optical axis. The first lens is closest to the object side and includes an object side surface, the object side surface is protruded along the optical axis, the first lens further includes a first portion close to the object side and a second portion close to the image side, and a diameter of the first portion is smaller than a diameter of the second portion so that a step is formed between the first portion and the second portion.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The lens assembly as claimed in claim 1, wherein the first lens further comprises an edge portion for the first lens to be supported and fixed, and the lens assembly satisfies: 0.19≤A/B≤0.28, where A is the maximal outer diameter of the first portion of the first lens, and B is the maximal outer diameter of the lens major diameter portion of the lens assembly.
3. The lens assembly as claimed in claim 2, wherein the lens barrel comprises a major diameter portion close to the image side and a minor diameter portion close to the object side, a stepped surface is formed between the major diameter portion and the minor diameter portion, the lens minor diameter portion is formed by the minor diameter portion of the lens barrel, and the lens major diameter portion is formed by the major diameter portion of the lens barrel.
4. The lens assembly as claimed in claim 3, wherein the edge portion of the first lens is fixed in the major diameter portion of the lens barrel, and the optical effective diameter portion is inside the minor diameter portion of the lens barrel.
5. The lens assembly as claimed in claim 2, wherein the edge portion is fixed in the lens barrel.
6. The lens assembly as claimed in claim 5, wherein the lens minor diameter portion is formed by the part of the optical effective diameter portion of the first lens, the lens major diameter portion is formed by the lens barrel, and an edge of the object side surface of the first lens is provided with a stop structure of the lens assembly.
7. The lens assembly as claimed in claim 1, further comprising a cover connected to an object end of the lens barrel, wherein the cover has an opening and forms a stop structure in front of the object side surface of the first lens.
8. The lens assembly as claimed in claim 7, wherein the object side surface of the first lens is flushed or is lower than an object side surface of the cover, the lens barrel and the cover are integrally formed as a continuous-unity piece, and the opening of the cover is in a shape of circle, polygon, non-circle, or polygon with sides arranged symmetrically to the optical axis.
9. The lens assembly as claimed in claim 8, wherein the first lens further comprises an edge portion for the first lens to be supported and fixed, and the lens assembly satisfies: 0.19≤A/B≤0.28, where A is the maximal outer diameter of the first portion of the first lens, and B is the maximal outer diameter of the lens major diameter portion of the lens assembly.
13. The lens assembly as claimed in claim 1, further comprising a fifth lens with positive refractive power, wherein the fifth lens is disposed between the first lens and the second lens, the object side surface of the first lens is convex surface, the second lens comprises an object side surface and an image side surface, the fifth lens comprises an object side surface and an image side surface, the image side surface of the fifth lens is convex surface.
14. The lens assembly as claimed in claim 1, wherein the object side surface of the first lens is convex surface, the third lens comprises an object side surface and an image side surface, the fourth lens comprises an object side surface and an image side surface, the third lens is with positive refractive power, the image side surface of the third lens is convex surface, and the image side surface of the fourth lens is concave surface.
19. The lens assembly as claimed in claim 16, wherein the fifth lens is with positive refractive power, the object side surface of the first lens is convex surface, and the image side surface of the fifth lens is convex surface.
20. The lens assembly as claimed in claim 16, wherein the object side surface of the first lens is convex surface, the third lens comprises an object side surface and an image side surface, the fourth lens comprises an object side surface and an image side surface, the third lens is with positive refractive power, the image side surface of the third lens is convex surface, and the image side surface of the fourth lens is concave surface.
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March 30, 2020
October 25, 2022
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